At-Home Tooth Whitening: At-home tooth whitening can be performed using whitening products available over-the-counter or prescribed by a dentist. This method typically involves using a special tooth whitening gel and a custom-fitted mouthguard. The gel is placed inside the mouthguard and applied to the teeth for a specific period of time. At-home tooth whitening is usually spread out over a longer duration.
In-Office Tooth Whitening: In-office tooth whitening is a procedure performed under the supervision of a dentist. In this method, the dentist applies a more concentrated whitening gel and may use a special light or laser. The gel is applied to the teeth by the dentist and allowed to take effect for a certain period of time. In-office tooth whitening typically provides faster results.

These information reflect the general process. However, the process can be different for each patient, and the stages can vary depending on the doctor’s evaluation and the patient’s needs.